mirror of
https://github.com/overleaf/overleaf.git
synced 2024-11-21 20:47:08 -05:00
492 lines
16 KiB
JavaScript
492 lines
16 KiB
JavaScript
/* eslint-disable
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camelcase,
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max-len,
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no-unused-vars,
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*/
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// TODO: This file was created by bulk-decaffeinate.
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// Fix any style issues and re-enable lint.
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/*
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* decaffeinate suggestions:
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* DS001: Remove Babel/TypeScript constructor workaround
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* DS101: Remove unnecessary use of Array.from
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* DS102: Remove unnecessary code created because of implicit returns
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* DS103: Rewrite code to no longer use __guard__
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* DS205: Consider reworking code to avoid use of IIFEs
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* DS206: Consider reworking classes to avoid initClass
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* DS207: Consider shorter variations of null checks
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* Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
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*/
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import EventEmitter from '../../utils/EventEmitter'
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import ShareJs from '../../vendor/libs/sharejs'
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import EditorWatchdogManager from '../connection/EditorWatchdogManager'
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let ShareJsDoc
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const SINGLE_USER_FLUSH_DELAY = 2000 // ms
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const MULTI_USER_FLUSH_DELAY = 500 // ms
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export default ShareJsDoc = (function () {
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ShareJsDoc = class ShareJsDoc extends EventEmitter {
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static initClass() {
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this.prototype.INFLIGHT_OP_TIMEOUT = 5000 // Retry sending ops after 5 seconds without an ack
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this.prototype.WAIT_FOR_CONNECTION_TIMEOUT = 500
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this.prototype.FATAL_OP_TIMEOUT = 30000
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}
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constructor(
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doc_id,
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docLines,
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version,
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socket,
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globalEditorWatchdogManager
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) {
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super()
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// Dencode any binary bits of data
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// See http://ecmanaut.blogspot.co.uk/2006/07/encoding-decoding-utf8-in-javascript.html
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this.doc_id = doc_id
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this.socket = socket
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this.type = 'text'
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docLines = Array.from(docLines).map(line =>
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decodeURIComponent(escape(line))
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)
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const snapshot = docLines.join('\n')
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this.track_changes = false
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this.connection = {
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send: update => {
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this._startInflightOpTimeout(update)
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if (
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window.disconnectOnUpdate != null &&
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Math.random() < window.disconnectOnUpdate
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) {
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sl_console.log('Disconnecting on update', update)
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window._ide.socket.socket.disconnect()
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}
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if (
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window.dropUpdates != null &&
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Math.random() < window.dropUpdates
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) {
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sl_console.log('Simulating a lost update', update)
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return
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}
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if (this.track_changes) {
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if (update.meta == null) {
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update.meta = {}
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}
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update.meta.tc = this.track_changes_id_seeds.inflight
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}
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return this.socket.emit(
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'applyOtUpdate',
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this.doc_id,
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update,
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error => {
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if (error != null) {
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return this._handleError(error)
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}
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}
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)
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},
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state: 'ok',
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id: this.socket.publicId,
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}
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this._doc = new ShareJs.Doc(this.connection, this.doc_id, {
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type: this.type,
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})
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this._doc.setFlushDelay(SINGLE_USER_FLUSH_DELAY)
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this._doc.on('change', (...args) => {
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return this.trigger('change', ...Array.from(args))
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})
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this.EditorWatchdogManager = new EditorWatchdogManager({
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parent: globalEditorWatchdogManager,
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})
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this._doc.on('acknowledge', () => {
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this.lastAcked = new Date() // note time of last ack from server for an op we sent
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this.EditorWatchdogManager.onAck() // keep track of last ack globally
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return this.trigger('acknowledge')
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})
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this._doc.on('remoteop', (...args) => {
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// As soon as we're working with a collaborator, start sending
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// ops more frequently for low latency.
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this._doc.setFlushDelay(MULTI_USER_FLUSH_DELAY)
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return this.trigger('remoteop', ...Array.from(args))
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})
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this._doc.on('flipped_pending_to_inflight', () => {
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return this.trigger('flipped_pending_to_inflight')
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})
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this._doc.on('saved', () => {
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return this.trigger('saved')
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})
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this._doc.on('error', e => {
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return this._handleError(e)
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})
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this._bindToDocChanges(this._doc)
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this.processUpdateFromServer({
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open: true,
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v: version,
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snapshot,
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})
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this._removeCarriageReturnCharFromShareJsDoc()
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}
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_removeCarriageReturnCharFromShareJsDoc() {
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const doc = this._doc
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if (doc.snapshot.indexOf('\r') === -1) {
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return
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}
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window._ide.pushEvent('remove-carriage-return-char', {
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doc_id: this.doc_id,
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})
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let nextPos
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while ((nextPos = doc.snapshot.indexOf('\r')) !== -1) {
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sl_console.log('[ShareJsDoc] remove-carriage-return-char', nextPos)
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doc.del(nextPos, 1)
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}
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}
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submitOp(...args) {
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return this._doc.submitOp(...Array.from(args || []))
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}
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// The following code puts out of order messages into a queue
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// so that they can be processed in order. This is a workaround
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// for messages being delayed by redis cluster.
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// FIXME: REMOVE THIS WHEN REDIS PUBSUB IS SENDING MESSAGES IN ORDER
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_isAheadOfExpectedVersion(message) {
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return this._doc.version > 0 && message.v > this._doc.version
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}
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_pushOntoQueue(message) {
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sl_console.log(`[processUpdate] push onto queue ${message.v}`)
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// set a timer so that we never leave messages in the queue indefinitely
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if (!this.queuedMessageTimer) {
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this.queuedMessageTimer = setTimeout(() => {
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sl_console.log(`[processUpdate] queue timeout fired for ${message.v}`)
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// force the message to be processed after the timeout,
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// it will cause an error if the missing update has not arrived
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this.processUpdateFromServer(message)
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}, this.INFLIGHT_OP_TIMEOUT)
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}
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this.queuedMessages.push(message)
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// keep the queue in order, lowest version first
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this.queuedMessages.sort(function (a, b) {
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return a.v - b.v
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})
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}
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_clearQueue() {
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this.queuedMessages = []
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}
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_processQueue() {
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if (this.queuedMessages.length > 0) {
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const nextAvailableVersion = this.queuedMessages[0].v
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if (nextAvailableVersion > this._doc.version) {
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// there are updates we still can't apply yet
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} else {
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// there's a version we can accept on the queue, apply it
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sl_console.log(
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`[processUpdate] taken from queue ${nextAvailableVersion}`
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)
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this.processUpdateFromServerInOrder(this.queuedMessages.shift())
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// clear the pending timer if the queue has now been cleared
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if (this.queuedMessages.length === 0 && this.queuedMessageTimer) {
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sl_console.log('[processUpdate] queue is empty, cleared timeout')
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clearTimeout(this.queuedMessageTimer)
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this.queuedMessageTimer = null
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}
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}
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}
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}
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// FIXME: This is the new method which reorders incoming updates if needed
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// called from Document.js
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processUpdateFromServerInOrder(message) {
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// Create an array to hold queued messages
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if (!this.queuedMessages) {
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this.queuedMessages = []
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}
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// Is this update ahead of the next expected update?
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// If so, put it on a queue to be handled later.
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if (this._isAheadOfExpectedVersion(message)) {
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this._pushOntoQueue(message)
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return // defer processing this update for now
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}
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const error = this.processUpdateFromServer(message)
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if (
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error instanceof Error &&
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error.message === 'Invalid version from server'
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) {
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// if there was an error, abandon the queued updates ahead of this one
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this._clearQueue()
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return
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}
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// Do we have any messages queued up?
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// find the next message if available
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this._processQueue()
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}
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// FIXME: This is the original method. Switch back to this when redis
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// issues are resolved.
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processUpdateFromServer(message) {
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try {
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this._doc._onMessage(message)
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} catch (error) {
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// Version mismatches are thrown as errors
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console.log(error)
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this._handleError(error)
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return error // return the error for queue handling
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}
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if (
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__guard__(message != null ? message.meta : undefined, x => x.type) ===
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'external'
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) {
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return this.trigger('externalUpdate', message)
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}
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}
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catchUp(updates) {
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return (() => {
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const result = []
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for (let i = 0; i < updates.length; i++) {
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const update = updates[i]
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update.v = this._doc.version
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update.doc = this.doc_id
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result.push(this.processUpdateFromServer(update))
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}
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return result
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})()
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}
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getSnapshot() {
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return this._doc.snapshot
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}
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getVersion() {
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return this._doc.version
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}
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getType() {
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return this.type
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}
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clearInflightAndPendingOps() {
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this._clearFatalTimeoutTimer()
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this._doc.inflightOp = null
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this._doc.inflightCallbacks = []
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this._doc.pendingOp = null
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return (this._doc.pendingCallbacks = [])
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}
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flushPendingOps() {
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// This will flush any ops that are pending.
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// If there is an inflight op it will do nothing.
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return this._doc.flush()
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}
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updateConnectionState(state) {
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sl_console.log(`[updateConnectionState] Setting state to ${state}`)
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this.connection.state = state
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this.connection.id = this.socket.publicId
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this._doc.autoOpen = false
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this._doc._connectionStateChanged(state)
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return (this.lastAcked = null) // reset the last ack time when connection changes
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}
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hasBufferedOps() {
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return this._doc.inflightOp != null || this._doc.pendingOp != null
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}
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getInflightOp() {
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return this._doc.inflightOp
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}
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getPendingOp() {
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return this._doc.pendingOp
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}
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getRecentAck() {
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// check if we have received an ack recently (within a factor of two of the single user flush delay)
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return (
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this.lastAcked != null &&
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new Date() - this.lastAcked < 2 * SINGLE_USER_FLUSH_DELAY
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)
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}
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getOpSize(op) {
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// compute size of an op from its components
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// (total number of characters inserted and deleted)
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let size = 0
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for (const component of Array.from(op || [])) {
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if ((component != null ? component.i : undefined) != null) {
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size += component.i.length
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}
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if ((component != null ? component.d : undefined) != null) {
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size += component.d.length
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}
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}
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return size
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}
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_attachEditorWatchdogManager(editorName, editor) {
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// end-to-end check for edits -> acks, for this very ShareJsdoc
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// This will catch a broken connection and missing UX-blocker for the
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// user, allowing them to keep editing.
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this._detachEditorWatchdogManager =
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this.EditorWatchdogManager.attachToEditor(editorName, editor)
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}
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_attachToEditor(editorName, editor, attachToShareJs) {
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this._attachEditorWatchdogManager(editorName, editor)
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attachToShareJs()
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}
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_maybeDetachEditorWatchdogManager() {
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// a failed attach attempt may lead to a missing cleanup handler
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if (this._detachEditorWatchdogManager) {
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this._detachEditorWatchdogManager()
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delete this._detachEditorWatchdogManager
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}
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}
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attachToAce(ace) {
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this._attachToEditor('Ace', ace, () => {
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this._doc.attach_ace(ace, false, window.maxDocLength)
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})
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}
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detachFromAce() {
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this._maybeDetachEditorWatchdogManager()
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return typeof this._doc.detach_ace === 'function'
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? this._doc.detach_ace()
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: undefined
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}
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attachToCM(cm) {
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this._attachToEditor('CM', cm, () => {
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this._doc.attach_cm(cm, false)
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})
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}
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detachFromCM() {
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this._maybeDetachEditorWatchdogManager()
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return typeof this._doc.detach_cm === 'function'
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? this._doc.detach_cm()
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: undefined
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} // If we're waiting for the project to join, try again in 0.5 seconds
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attachToCM6(cm6) {
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this._attachToEditor('CM6', cm6, () => {
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cm6.attachShareJs(this._doc)
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})
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}
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detachFromCM6() {
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this._maybeDetachEditorWatchdogManager()
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if (this._doc.detach_cm6) {
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this._doc.detach_cm6()
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}
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}
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_startInflightOpTimeout(update) {
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this._startFatalTimeoutTimer(update)
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const retryOp = () => {
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// Only send the update again if inflightOp is still populated
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// This can be cleared when hard reloading the document in which
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// case we don't want to keep trying to send it.
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sl_console.log('[inflightOpTimeout] Trying op again')
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if (this._doc.inflightOp != null) {
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// When there is a socket.io disconnect, @_doc.inflightSubmittedIds
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// is updated with the socket.io client id of the current op in flight
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// (meta.source of the op).
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// @connection.id is the client id of the current socket.io session.
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// So we need both depending on whether the op was submitted before
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// one or more disconnects, or if it was submitted during the current session.
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update.dupIfSource = [
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this.connection.id,
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...Array.from(this._doc.inflightSubmittedIds),
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]
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// We must be joined to a project for applyOtUpdate to work on the real-time
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// service, so don't send an op if we're not. Connection state is set to 'ok'
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// when we've joined the project
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if (this.connection.state !== 'ok') {
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let timer
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sl_console.log(
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'[inflightOpTimeout] Not connected, retrying in 0.5s'
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)
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return (timer = setTimeout(
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retryOp,
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this.WAIT_FOR_CONNECTION_TIMEOUT
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))
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} else {
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sl_console.log('[inflightOpTimeout] Sending')
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return this.connection.send(update)
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}
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}
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}
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const timer = setTimeout(retryOp, this.INFLIGHT_OP_TIMEOUT)
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return this._doc.inflightCallbacks.push(() => {
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this._clearFatalTimeoutTimer()
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return clearTimeout(timer)
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}) // 30 seconds
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}
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_startFatalTimeoutTimer(update) {
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// If an op doesn't get acked within FATAL_OP_TIMEOUT, something has
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// gone unrecoverably wrong (the op will have been retried multiple times)
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if (this._timeoutTimer != null) {
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return
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}
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return (this._timeoutTimer = setTimeout(() => {
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this._clearFatalTimeoutTimer()
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return this.trigger('op:timeout', update)
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}, this.FATAL_OP_TIMEOUT))
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}
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_clearFatalTimeoutTimer() {
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if (this._timeoutTimer == null) {
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return
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}
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clearTimeout(this._timeoutTimer)
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return (this._timeoutTimer = null)
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}
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_handleError(error, meta) {
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if (meta == null) {
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meta = {}
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}
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return this.trigger('error', error, meta)
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}
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_bindToDocChanges(doc) {
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const { submitOp } = doc
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doc.submitOp = (...args) => {
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this.trigger('op:sent', ...Array.from(args))
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doc.pendingCallbacks.push(() => {
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return this.trigger('op:acknowledged', ...Array.from(args))
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})
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return submitOp.apply(doc, args)
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}
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const { flush } = doc
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return (doc.flush = (...args) => {
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this.trigger('flush', doc.inflightOp, doc.pendingOp, doc.version)
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return flush.apply(doc, args)
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})
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}
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}
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ShareJsDoc.initClass()
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return ShareJsDoc
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})()
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function __guard__(value, transform) {
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return typeof value !== 'undefined' && value !== null
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? transform(value)
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: undefined
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}
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